TransitGame - Try to site the
transit system to minimize costs and maximize access to stations.
The cost figures are crude, but on the right order of magnitude,
and allow comparison of one solution with another.

AllCent3 - simulates an evolving
market system in which 'stores' fail or succeed dependent on
proximity to customers.

Colonize - crudely simulates
colonizers trying to reach Hawaii from the edges of the Pacific.